Periyar may refer to

• Periyar River, a major river in Kerala
• Periyar District, the erstwhile name for Erode district in Tamil Nadu
• Periyar National Park
• Periyar University
• Periyar Maniammai University
• Periyar E. V. Ramasamy, a Tamil social reformer popularly known as Periyar
• Periyar E. V. Ramasamy and the eradication of caste
• Periyar E. V. Ramasamy and the Indian National Congress
• Periyar E. V. Ramasamy and religion
• Periyar E. V. Ramasamy and social reform
• Periyar E. V. Ramasamy and Tamil grammar
• Periyar E. V. Ramasamy and women's rights
• Periyar (film) ‎

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